Thetford Mines, Quebec climate data is summarized below. Average annual temperatures range from 30.8 °F (low) to 48.4 °F (high). Annual precipitation averages 4.9 Inches. Thetford Mines is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -26.6 °F | -21.3 °F | 0 in. |
| February | -26.4 °F | -21.1 °F | 0 in. |
| March | -23.3 °F | -17.9 °F | 0 in. |
| April | -19 °F | -13.5 °F | 355.6 in. |
| May | -14.9 °F | -8.6 °F | 406.4 in. |
| June | -12.2 °F | -6.1 °F | 330.2 in. |
| July | -10.6 °F | -4.7 °F | 558.8 in. |
| August | -11 °F | -5.2 °F | 457.2 in. |
| September | -13.5 °F | -7.5 °F | 228.6 in. |
| October | -16.5 °F | -11.6 °F | 406.4 in. |
| November | -19.9 °F | -15.5 °F | 304.8 in. |
| December | -24.1 °F | -19.7 °F | 101.6 in. |
| Annual | 30.8 °F | 48.4 °F | 4.88 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |